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kvm tools, setup: Create private directory
[linux-2.6/next.git] / net / 9p / client.c
blob9e3b0e640da179a122f6f846bd8cff31920db159
1 /*
2 * net/9p/clnt.c
3 *
4 * 9P Client
5 *
6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26 #include <linux/module.h>
27 #include <linux/errno.h>
28 #include <linux/fs.h>
29 #include <linux/poll.h>
30 #include <linux/idr.h>
31 #include <linux/mutex.h>
32 #include <linux/slab.h>
33 #include <linux/sched.h>
34 #include <linux/uaccess.h>
35 #include <net/9p/9p.h>
36 #include <linux/parser.h>
37 #include <net/9p/client.h>
38 #include <net/9p/transport.h>
39 #include "protocol.h"
40
41 /*
42 * Client Option Parsing (code inspired by NFS code)
43 * - a little lazy - parse all client options
44 */
45
46 enum {
47 Opt_msize,
48 Opt_trans,
49 Opt_legacy,
50 Opt_version,
51 Opt_err,
52 };
53
54 static const match_table_t tokens = {
55 {Opt_msize, "msize=%u"},
56 {Opt_legacy, "noextend"},
57 {Opt_trans, "trans=%s"},
58 {Opt_version, "version=%s"},
59 {Opt_err, NULL},
60 };
61
62 inline int p9_is_proto_dotl(struct p9_client *clnt)
63 {
64 return clnt->proto_version == p9_proto_2000L;
65 }
66 EXPORT_SYMBOL(p9_is_proto_dotl);
67
68 inline int p9_is_proto_dotu(struct p9_client *clnt)
69 {
70 return clnt->proto_version == p9_proto_2000u;
71 }
72 EXPORT_SYMBOL(p9_is_proto_dotu);
73
74 /* Interpret mount option for protocol version */
75 static int get_protocol_version(const substring_t *name)
76 {
77 int version = -EINVAL;
78
79 if (!strncmp("9p2000", name->from, name->to-name->from)) {
80 version = p9_proto_legacy;
81 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n");
82 } else if (!strncmp("9p2000.u", name->from, name->to-name->from)) {
83 version = p9_proto_2000u;
84 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
85 } else if (!strncmp("9p2000.L", name->from, name->to-name->from)) {
86 version = p9_proto_2000L;
87 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
88 } else {
89 P9_DPRINTK(P9_DEBUG_ERROR, "Unknown protocol version %s. ",
90 name->from);
91 }
92 return version;
93 }
94
95 /**
96 * parse_options - parse mount options into client structure
97 * @opts: options string passed from mount
98 * @clnt: existing v9fs client information
99 *
100 * Return 0 upon success, -ERRNO upon failure
101 */
102
103 static int parse_opts(char *opts, struct p9_client *clnt)
104 {
105 char *options, *tmp_options;
106 char *p;
107 substring_t args[MAX_OPT_ARGS];
108 int option;
109 int ret = 0;
110
111 clnt->proto_version = p9_proto_2000u;
112 clnt->msize = 8192;
113
114 if (!opts)
115 return 0;
116
117 tmp_options = kstrdup(opts, GFP_KERNEL);
118 if (!tmp_options) {
119 P9_DPRINTK(P9_DEBUG_ERROR,
120 "failed to allocate copy of option string\n");
121 return -ENOMEM;
122 }
123 options = tmp_options;
124
125 while ((p = strsep(&options, ",")) != NULL) {
126 int token;
127 if (!*p)
128 continue;
129 token = match_token(p, tokens, args);
130 if (token < Opt_trans) {
131 int r = match_int(&args[0], &option);
132 if (r < 0) {
133 P9_DPRINTK(P9_DEBUG_ERROR,
134 "integer field, but no integer?\n");
135 ret = r;
136 continue;
137 }
138 }
139 switch (token) {
140 case Opt_msize:
141 clnt->msize = option;
142 break;
143 case Opt_trans:
144 clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
145 if(clnt->trans_mod == NULL) {
146 P9_DPRINTK(P9_DEBUG_ERROR,
147 "Could not find request transport: %s\n",
148 (char *) &args[0]);
149 ret = -EINVAL;
150 goto free_and_return;
151 }
152 break;
153 case Opt_legacy:
154 clnt->proto_version = p9_proto_legacy;
155 break;
156 case Opt_version:
157 ret = get_protocol_version(&args[0]);
158 if (ret == -EINVAL)
159 goto free_and_return;
160 clnt->proto_version = ret;
161 break;
162 default:
163 continue;
164 }
165 }
166
167 free_and_return:
168 kfree(tmp_options);
169 return ret;
170 }
171
172 /**
173 * p9_tag_alloc - lookup/allocate a request by tag
174 * @c: client session to lookup tag within
175 * @tag: numeric id for transaction
176 *
177 * this is a simple array lookup, but will grow the
178 * request_slots as necessary to accommodate transaction
179 * ids which did not previously have a slot.
180 *
181 * this code relies on the client spinlock to manage locks, its
182 * possible we should switch to something else, but I'd rather
183 * stick with something low-overhead for the common case.
184 *
185 */
186
187 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
188 {
189 unsigned long flags;
190 int row, col;
191 struct p9_req_t *req;
192
193 /* This looks up the original request by tag so we know which
194 * buffer to read the data into */
195 tag++;
196
197 if (tag >= c->max_tag) {
198 spin_lock_irqsave(&c->lock, flags);
199 /* check again since original check was outside of lock */
200 while (tag >= c->max_tag) {
201 row = (tag / P9_ROW_MAXTAG);
202 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
203 sizeof(struct p9_req_t), GFP_ATOMIC);
204
205 if (!c->reqs[row]) {
206 printk(KERN_ERR "Couldn't grow tag array\n");
207 spin_unlock_irqrestore(&c->lock, flags);
208 return ERR_PTR(-ENOMEM);
209 }
210 for (col = 0; col < P9_ROW_MAXTAG; col++) {
211 c->reqs[row][col].status = REQ_STATUS_IDLE;
212 c->reqs[row][col].tc = NULL;
213 }
214 c->max_tag += P9_ROW_MAXTAG;
215 }
216 spin_unlock_irqrestore(&c->lock, flags);
217 }
218 row = tag / P9_ROW_MAXTAG;
219 col = tag % P9_ROW_MAXTAG;
220
221 req = &c->reqs[row][col];
222 if (!req->tc) {
223 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
224 if (!req->wq) {
225 printk(KERN_ERR "Couldn't grow tag array\n");
226 return ERR_PTR(-ENOMEM);
227 }
228 init_waitqueue_head(req->wq);
229 if ((c->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
230 P9_TRANS_PREF_PAYLOAD_SEP) {
231 int alloc_msize = min(c->msize, 4096);
232 req->tc = kmalloc(sizeof(struct p9_fcall)+alloc_msize,
233 GFP_NOFS);
234 req->tc->capacity = alloc_msize;
235 req->rc = kmalloc(sizeof(struct p9_fcall)+alloc_msize,
236 GFP_NOFS);
237 req->rc->capacity = alloc_msize;
238 } else {
239 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
240 GFP_NOFS);
241 req->tc->capacity = c->msize;
242 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
243 GFP_NOFS);
244 req->rc->capacity = c->msize;
245 }
246 if ((!req->tc) || (!req->rc)) {
247 printk(KERN_ERR "Couldn't grow tag array\n");
248 kfree(req->tc);
249 kfree(req->rc);
250 kfree(req->wq);
251 req->tc = req->rc = NULL;
252 req->wq = NULL;
253 return ERR_PTR(-ENOMEM);
254 }
255 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
256 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
257 }
258
259 p9pdu_reset(req->tc);
260 p9pdu_reset(req->rc);
261
262 req->tc->tag = tag-1;
263 req->status = REQ_STATUS_ALLOC;
264
265 return &c->reqs[row][col];
266 }
267
268 /**
269 * p9_tag_lookup - lookup a request by tag
270 * @c: client session to lookup tag within
271 * @tag: numeric id for transaction
272 *
273 */
274
275 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
276 {
277 int row, col;
278
279 /* This looks up the original request by tag so we know which
280 * buffer to read the data into */
281 tag++;
282
283 BUG_ON(tag >= c->max_tag);
284
285 row = tag / P9_ROW_MAXTAG;
286 col = tag % P9_ROW_MAXTAG;
287
288 return &c->reqs[row][col];
289 }
290 EXPORT_SYMBOL(p9_tag_lookup);
291
292 /**
293 * p9_tag_init - setup tags structure and contents
294 * @c: v9fs client struct
295 *
296 * This initializes the tags structure for each client instance.
297 *
298 */
299
300 static int p9_tag_init(struct p9_client *c)
301 {
302 int err = 0;
303
304 c->tagpool = p9_idpool_create();
305 if (IS_ERR(c->tagpool)) {
306 err = PTR_ERR(c->tagpool);
307 goto error;
308 }
309 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
310 if (err < 0) {
311 p9_idpool_destroy(c->tagpool);
312 goto error;
313 }
314 c->max_tag = 0;
315 error:
316 return err;
317 }
318
319 /**
320 * p9_tag_cleanup - cleans up tags structure and reclaims resources
321 * @c: v9fs client struct
322 *
323 * This frees resources associated with the tags structure
324 *
325 */
326 static void p9_tag_cleanup(struct p9_client *c)
327 {
328 int row, col;
329
330 /* check to insure all requests are idle */
331 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
332 for (col = 0; col < P9_ROW_MAXTAG; col++) {
333 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
334 P9_DPRINTK(P9_DEBUG_MUX,
335 "Attempting to cleanup non-free tag %d,%d\n",
336 row, col);
337 /* TODO: delay execution of cleanup */
338 return;
339 }
340 }
341 }
342
343 if (c->tagpool) {
344 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
345 p9_idpool_destroy(c->tagpool);
346 }
347
348 /* free requests associated with tags */
349 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
350 for (col = 0; col < P9_ROW_MAXTAG; col++) {
351 kfree(c->reqs[row][col].wq);
352 kfree(c->reqs[row][col].tc);
353 kfree(c->reqs[row][col].rc);
354 }
355 kfree(c->reqs[row]);
356 }
357 c->max_tag = 0;
358 }
359
360 /**
361 * p9_free_req - free a request and clean-up as necessary
362 * c: client state
363 * r: request to release
364 *
365 */
366
367 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
368 {
369 int tag = r->tc->tag;
370 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
371
372 r->status = REQ_STATUS_IDLE;
373 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
374 p9_idpool_put(tag, c->tagpool);
375 }
376
377 /**
378 * p9_client_cb - call back from transport to client
379 * c: client state
380 * req: request received
381 *
382 */
383 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
384 {
385 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
386 wake_up(req->wq);
387 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
388 }
389 EXPORT_SYMBOL(p9_client_cb);
390
391 /**
392 * p9_parse_header - parse header arguments out of a packet
393 * @pdu: packet to parse
394 * @size: size of packet
395 * @type: type of request
396 * @tag: tag of packet
397 * @rewind: set if we need to rewind offset afterwards
398 */
399
400 int
401 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
402 int rewind)
403 {
404 int8_t r_type;
405 int16_t r_tag;
406 int32_t r_size;
407 int offset = pdu->offset;
408 int err;
409
410 pdu->offset = 0;
411 if (pdu->size == 0)
412 pdu->size = 7;
413
414 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
415 if (err)
416 goto rewind_and_exit;
417
418 pdu->size = r_size;
419 pdu->id = r_type;
420 pdu->tag = r_tag;
421
422 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
423 pdu->id, pdu->tag);
424
425 if (type)
426 *type = r_type;
427 if (tag)
428 *tag = r_tag;
429 if (size)
430 *size = r_size;
431
432
433 rewind_and_exit:
434 if (rewind)
435 pdu->offset = offset;
436 return err;
437 }
438 EXPORT_SYMBOL(p9_parse_header);
439
440 /**
441 * p9_check_errors - check 9p packet for error return and process it
442 * @c: current client instance
443 * @req: request to parse and check for error conditions
444 *
445 * returns error code if one is discovered, otherwise returns 0
446 *
447 * this will have to be more complicated if we have multiple
448 * error packet types
449 */
450
451 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
452 {
453 int8_t type;
454 int err;
455 int ecode;
456
457 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
458 if (err) {
459 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
460 return err;
461 }
462
463 if (type != P9_RERROR && type != P9_RLERROR)
464 return 0;
465
466 if (!p9_is_proto_dotl(c)) {
467 char *ename;
468
469 if (req->tc->pbuf_size) {
470 /* Handle user buffers */
471 size_t len = req->rc->size - req->rc->offset;
472 if (req->tc->pubuf) {
473 /* User Buffer */
474 err = copy_from_user(
475 &req->rc->sdata[req->rc->offset],
476 req->tc->pubuf, len);
477 if (err) {
478 err = -EFAULT;
479 goto out_err;
480 }
481 } else {
482 /* Kernel Buffer */
483 memmove(&req->rc->sdata[req->rc->offset],
484 req->tc->pkbuf, len);
485 }
486 }
487 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
488 &ename, &ecode);
489 if (err)
490 goto out_err;
491
492 if (p9_is_proto_dotu(c))
493 err = -ecode;
494
495 if (!err || !IS_ERR_VALUE(err)) {
496 err = p9_errstr2errno(ename, strlen(ename));
497
498 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode,
499 ename);
500
501 kfree(ename);
502 }
503 } else {
504 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
505 err = -ecode;
506
507 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
508 }
509
510
511 return err;
512
513 out_err:
514 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
515
516 return err;
517 }
518
519 static struct p9_req_t *
520 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
521
522 /**
523 * p9_client_flush - flush (cancel) a request
524 * @c: client state
525 * @oldreq: request to cancel
526 *
527 * This sents a flush for a particular request and links
528 * the flush request to the original request. The current
529 * code only supports a single flush request although the protocol
530 * allows for multiple flush requests to be sent for a single request.
531 *
532 */
533
534 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
535 {
536 struct p9_req_t *req;
537 int16_t oldtag;
538 int err;
539
540 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
541 if (err)
542 return err;
543
544 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
545
546 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
547 if (IS_ERR(req))
548 return PTR_ERR(req);
549
550
551 /* if we haven't received a response for oldreq,
552 remove it from the list. */
553 spin_lock(&c->lock);
554 if (oldreq->status == REQ_STATUS_FLSH)
555 list_del(&oldreq->req_list);
556 spin_unlock(&c->lock);
557
558 p9_free_req(c, req);
559 return 0;
560 }
561
562 /**
563 * p9_client_rpc - issue a request and wait for a response
564 * @c: client session
565 * @type: type of request
566 * @fmt: protocol format string (see protocol.c)
567 *
568 * Returns request structure (which client must free using p9_free_req)
569 */
570
571 static struct p9_req_t *
572 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
573 {
574 va_list ap;
575 int tag, err;
576 struct p9_req_t *req;
577 unsigned long flags;
578 int sigpending;
579
580 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
581
582 /* we allow for any status other than disconnected */
583 if (c->status == Disconnected)
584 return ERR_PTR(-EIO);
585
586 /* if status is begin_disconnected we allow only clunk request */
587 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
588 return ERR_PTR(-EIO);
589
590 if (signal_pending(current)) {
591 sigpending = 1;
592 clear_thread_flag(TIF_SIGPENDING);
593 } else
594 sigpending = 0;
595
596 tag = P9_NOTAG;
597 if (type != P9_TVERSION) {
598 tag = p9_idpool_get(c->tagpool);
599 if (tag < 0)
600 return ERR_PTR(-ENOMEM);
601 }
602
603 req = p9_tag_alloc(c, tag);
604 if (IS_ERR(req))
605 return req;
606
607 /* marshall the data */
608 p9pdu_prepare(req->tc, tag, type);
609 va_start(ap, fmt);
610 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
611 va_end(ap);
612 if (err)
613 goto reterr;
614 p9pdu_finalize(req->tc);
615
616 err = c->trans_mod->request(c, req);
617 if (err < 0) {
618 if (err != -ERESTARTSYS && err != -EFAULT)
619 c->status = Disconnected;
620 goto reterr;
621 }
622
623 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
624 err = wait_event_interruptible(*req->wq,
625 req->status >= REQ_STATUS_RCVD);
626 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
627 req->wq, tag, err);
628
629 if (req->status == REQ_STATUS_ERROR) {
630 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
631 err = req->t_err;
632 }
633
634 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
635 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
636 sigpending = 1;
637 clear_thread_flag(TIF_SIGPENDING);
638
639 if (c->trans_mod->cancel(c, req))
640 p9_client_flush(c, req);
641
642 /* if we received the response anyway, don't signal error */
643 if (req->status == REQ_STATUS_RCVD)
644 err = 0;
645 }
646
647 if (sigpending) {
648 spin_lock_irqsave(&current->sighand->siglock, flags);
649 recalc_sigpending();
650 spin_unlock_irqrestore(&current->sighand->siglock, flags);
651 }
652
653 if (err < 0)
654 goto reterr;
655
656 err = p9_check_errors(c, req);
657 if (!err) {
658 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
659 return req;
660 }
661
662 reterr:
663 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
664 err);
665 p9_free_req(c, req);
666 return ERR_PTR(err);
667 }
668
669 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
670 {
671 int ret;
672 struct p9_fid *fid;
673 unsigned long flags;
674
675 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
676 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
677 if (!fid)
678 return ERR_PTR(-ENOMEM);
679
680 ret = p9_idpool_get(clnt->fidpool);
681 if (ret < 0) {
682 ret = -ENOSPC;
683 goto error;
684 }
685 fid->fid = ret;
686
687 memset(&fid->qid, 0, sizeof(struct p9_qid));
688 fid->mode = -1;
689 fid->uid = current_fsuid();
690 fid->clnt = clnt;
691 fid->rdir = NULL;
692 spin_lock_irqsave(&clnt->lock, flags);
693 list_add(&fid->flist, &clnt->fidlist);
694 spin_unlock_irqrestore(&clnt->lock, flags);
695
696 return fid;
697
698 error:
699 kfree(fid);
700 return ERR_PTR(ret);
701 }
702
703 static void p9_fid_destroy(struct p9_fid *fid)
704 {
705 struct p9_client *clnt;
706 unsigned long flags;
707
708 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
709 clnt = fid->clnt;
710 p9_idpool_put(fid->fid, clnt->fidpool);
711 spin_lock_irqsave(&clnt->lock, flags);
712 list_del(&fid->flist);
713 spin_unlock_irqrestore(&clnt->lock, flags);
714 kfree(fid->rdir);
715 kfree(fid);
716 }
717
718 static int p9_client_version(struct p9_client *c)
719 {
720 int err = 0;
721 struct p9_req_t *req;
722 char *version;
723 int msize;
724
725 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
726 c->msize, c->proto_version);
727
728 switch (c->proto_version) {
729 case p9_proto_2000L:
730 req = p9_client_rpc(c, P9_TVERSION, "ds",
731 c->msize, "9P2000.L");
732 break;
733 case p9_proto_2000u:
734 req = p9_client_rpc(c, P9_TVERSION, "ds",
735 c->msize, "9P2000.u");
736 break;
737 case p9_proto_legacy:
738 req = p9_client_rpc(c, P9_TVERSION, "ds",
739 c->msize, "9P2000");
740 break;
741 default:
742 return -EINVAL;
743 break;
744 }
745
746 if (IS_ERR(req))
747 return PTR_ERR(req);
748
749 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
750 if (err) {
751 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
752 p9pdu_dump(1, req->rc);
753 goto error;
754 }
755
756 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
757 if (!strncmp(version, "9P2000.L", 8))
758 c->proto_version = p9_proto_2000L;
759 else if (!strncmp(version, "9P2000.u", 8))
760 c->proto_version = p9_proto_2000u;
761 else if (!strncmp(version, "9P2000", 6))
762 c->proto_version = p9_proto_legacy;
763 else {
764 err = -EREMOTEIO;
765 goto error;
766 }
767
768 if (msize < c->msize)
769 c->msize = msize;
770
771 error:
772 kfree(version);
773 p9_free_req(c, req);
774
775 return err;
776 }
777
778 struct p9_client *p9_client_create(const char *dev_name, char *options)
779 {
780 int err;
781 struct p9_client *clnt;
782
783 err = 0;
784 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
785 if (!clnt)
786 return ERR_PTR(-ENOMEM);
787
788 clnt->trans_mod = NULL;
789 clnt->trans = NULL;
790 spin_lock_init(&clnt->lock);
791 INIT_LIST_HEAD(&clnt->fidlist);
792
793 err = p9_tag_init(clnt);
794 if (err < 0)
795 goto free_client;
796
797 err = parse_opts(options, clnt);
798 if (err < 0)
799 goto destroy_tagpool;
800
801 if (!clnt->trans_mod)
802 clnt->trans_mod = v9fs_get_default_trans();
803
804 if (clnt->trans_mod == NULL) {
805 err = -EPROTONOSUPPORT;
806 P9_DPRINTK(P9_DEBUG_ERROR,
807 "No transport defined or default transport\n");
808 goto destroy_tagpool;
809 }
810
811 clnt->fidpool = p9_idpool_create();
812 if (IS_ERR(clnt->fidpool)) {
813 err = PTR_ERR(clnt->fidpool);
814 goto put_trans;
815 }
816
817 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
818 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
819
820 err = clnt->trans_mod->create(clnt, dev_name, options);
821 if (err)
822 goto destroy_fidpool;
823
824 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
825 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
826
827 err = p9_client_version(clnt);
828 if (err)
829 goto close_trans;
830
831 return clnt;
832
833 close_trans:
834 clnt->trans_mod->close(clnt);
835 destroy_fidpool:
836 p9_idpool_destroy(clnt->fidpool);
837 put_trans:
838 v9fs_put_trans(clnt->trans_mod);
839 destroy_tagpool:
840 p9_idpool_destroy(clnt->tagpool);
841 free_client:
842 kfree(clnt);
843 return ERR_PTR(err);
844 }
845 EXPORT_SYMBOL(p9_client_create);
846
847 void p9_client_destroy(struct p9_client *clnt)
848 {
849 struct p9_fid *fid, *fidptr;
850
851 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
852
853 if (clnt->trans_mod)
854 clnt->trans_mod->close(clnt);
855
856 v9fs_put_trans(clnt->trans_mod);
857
858 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
859 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
860 p9_fid_destroy(fid);
861 }
862
863 if (clnt->fidpool)
864 p9_idpool_destroy(clnt->fidpool);
865
866 p9_tag_cleanup(clnt);
867
868 kfree(clnt);
869 }
870 EXPORT_SYMBOL(p9_client_destroy);
871
872 void p9_client_disconnect(struct p9_client *clnt)
873 {
874 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
875 clnt->status = Disconnected;
876 }
877 EXPORT_SYMBOL(p9_client_disconnect);
878
879 void p9_client_begin_disconnect(struct p9_client *clnt)
880 {
881 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
882 clnt->status = BeginDisconnect;
883 }
884 EXPORT_SYMBOL(p9_client_begin_disconnect);
885
886 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
887 char *uname, u32 n_uname, char *aname)
888 {
889 int err;
890 struct p9_req_t *req;
891 struct p9_fid *fid;
892 struct p9_qid qid;
893
894 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
895 afid ? afid->fid : -1, uname, aname);
896 err = 0;
897
898 fid = p9_fid_create(clnt);
899 if (IS_ERR(fid)) {
900 err = PTR_ERR(fid);
901 fid = NULL;
902 goto error;
903 }
904
905 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
906 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
907 if (IS_ERR(req)) {
908 err = PTR_ERR(req);
909 goto error;
910 }
911
912 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
913 if (err) {
914 p9pdu_dump(1, req->rc);
915 p9_free_req(clnt, req);
916 goto error;
917 }
918
919 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
920 qid.type,
921 (unsigned long long)qid.path,
922 qid.version);
923
924 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
925
926 p9_free_req(clnt, req);
927 return fid;
928
929 error:
930 if (fid)
931 p9_fid_destroy(fid);
932 return ERR_PTR(err);
933 }
934 EXPORT_SYMBOL(p9_client_attach);
935
936 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
937 char **wnames, int clone)
938 {
939 int err;
940 struct p9_client *clnt;
941 struct p9_fid *fid;
942 struct p9_qid *wqids;
943 struct p9_req_t *req;
944 uint16_t nwqids, count;
945
946 err = 0;
947 wqids = NULL;
948 clnt = oldfid->clnt;
949 if (clone) {
950 fid = p9_fid_create(clnt);
951 if (IS_ERR(fid)) {
952 err = PTR_ERR(fid);
953 fid = NULL;
954 goto error;
955 }
956
957 fid->uid = oldfid->uid;
958 } else
959 fid = oldfid;
960
961
962 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
963 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
964
965 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
966 nwname, wnames);
967 if (IS_ERR(req)) {
968 err = PTR_ERR(req);
969 goto error;
970 }
971
972 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
973 if (err) {
974 p9pdu_dump(1, req->rc);
975 p9_free_req(clnt, req);
976 goto clunk_fid;
977 }
978 p9_free_req(clnt, req);
979
980 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
981
982 if (nwqids != nwname) {
983 err = -ENOENT;
984 goto clunk_fid;
985 }
986
987 for (count = 0; count < nwqids; count++)
988 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
989 count, wqids[count].type,
990 (unsigned long long)wqids[count].path,
991 wqids[count].version);
992
993 if (nwname)
994 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
995 else
996 fid->qid = oldfid->qid;
997
998 kfree(wqids);
999 return fid;
1000
1001 clunk_fid:
1002 kfree(wqids);
1003 p9_client_clunk(fid);
1004 fid = NULL;
1005
1006 error:
1007 if (fid && (fid != oldfid))
1008 p9_fid_destroy(fid);
1009
1010 return ERR_PTR(err);
1011 }
1012 EXPORT_SYMBOL(p9_client_walk);
1013
1014 int p9_client_open(struct p9_fid *fid, int mode)
1015 {
1016 int err;
1017 struct p9_client *clnt;
1018 struct p9_req_t *req;
1019 struct p9_qid qid;
1020 int iounit;
1021
1022 clnt = fid->clnt;
1023 P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1024 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1025 err = 0;
1026
1027 if (fid->mode != -1)
1028 return -EINVAL;
1029
1030 if (p9_is_proto_dotl(clnt))
1031 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1032 else
1033 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1034 if (IS_ERR(req)) {
1035 err = PTR_ERR(req);
1036 goto error;
1037 }
1038
1039 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1040 if (err) {
1041 p9pdu_dump(1, req->rc);
1042 goto free_and_error;
1043 }
1044
1045 P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1046 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1047 (unsigned long long)qid.path, qid.version, iounit);
1048
1049 fid->mode = mode;
1050 fid->iounit = iounit;
1051
1052 free_and_error:
1053 p9_free_req(clnt, req);
1054 error:
1055 return err;
1056 }
1057 EXPORT_SYMBOL(p9_client_open);
1058
1059 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1060 gid_t gid, struct p9_qid *qid)
1061 {
1062 int err = 0;
1063 struct p9_client *clnt;
1064 struct p9_req_t *req;
1065 int iounit;
1066
1067 P9_DPRINTK(P9_DEBUG_9P,
1068 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1069 ofid->fid, name, flags, mode, gid);
1070 clnt = ofid->clnt;
1071
1072 if (ofid->mode != -1)
1073 return -EINVAL;
1074
1075 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1076 mode, gid);
1077 if (IS_ERR(req)) {
1078 err = PTR_ERR(req);
1079 goto error;
1080 }
1081
1082 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1083 if (err) {
1084 p9pdu_dump(1, req->rc);
1085 goto free_and_error;
1086 }
1087
1088 P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1089 qid->type,
1090 (unsigned long long)qid->path,
1091 qid->version, iounit);
1092
1093 ofid->mode = mode;
1094 ofid->iounit = iounit;
1095
1096 free_and_error:
1097 p9_free_req(clnt, req);
1098 error:
1099 return err;
1100 }
1101 EXPORT_SYMBOL(p9_client_create_dotl);
1102
1103 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1104 char *extension)
1105 {
1106 int err;
1107 struct p9_client *clnt;
1108 struct p9_req_t *req;
1109 struct p9_qid qid;
1110 int iounit;
1111
1112 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1113 fid->fid, name, perm, mode);
1114 err = 0;
1115 clnt = fid->clnt;
1116
1117 if (fid->mode != -1)
1118 return -EINVAL;
1119
1120 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1121 mode, extension);
1122 if (IS_ERR(req)) {
1123 err = PTR_ERR(req);
1124 goto error;
1125 }
1126
1127 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1128 if (err) {
1129 p9pdu_dump(1, req->rc);
1130 goto free_and_error;
1131 }
1132
1133 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1134 qid.type,
1135 (unsigned long long)qid.path,
1136 qid.version, iounit);
1137
1138 fid->mode = mode;
1139 fid->iounit = iounit;
1140
1141 free_and_error:
1142 p9_free_req(clnt, req);
1143 error:
1144 return err;
1145 }
1146 EXPORT_SYMBOL(p9_client_fcreate);
1147
1148 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1149 struct p9_qid *qid)
1150 {
1151 int err = 0;
1152 struct p9_client *clnt;
1153 struct p9_req_t *req;
1154
1155 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1156 dfid->fid, name, symtgt);
1157 clnt = dfid->clnt;
1158
1159 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1160 gid);
1161 if (IS_ERR(req)) {
1162 err = PTR_ERR(req);
1163 goto error;
1164 }
1165
1166 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1167 if (err) {
1168 p9pdu_dump(1, req->rc);
1169 goto free_and_error;
1170 }
1171
1172 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1173 qid->type, (unsigned long long)qid->path, qid->version);
1174
1175 free_and_error:
1176 p9_free_req(clnt, req);
1177 error:
1178 return err;
1179 }
1180 EXPORT_SYMBOL(p9_client_symlink);
1181
1182 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1183 {
1184 struct p9_client *clnt;
1185 struct p9_req_t *req;
1186
1187 P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1188 dfid->fid, oldfid->fid, newname);
1189 clnt = dfid->clnt;
1190 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1191 newname);
1192 if (IS_ERR(req))
1193 return PTR_ERR(req);
1194
1195 P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1196 p9_free_req(clnt, req);
1197 return 0;
1198 }
1199 EXPORT_SYMBOL(p9_client_link);
1200
1201 int p9_client_fsync(struct p9_fid *fid, int datasync)
1202 {
1203 int err;
1204 struct p9_client *clnt;
1205 struct p9_req_t *req;
1206
1207 P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1208 fid->fid, datasync);
1209 err = 0;
1210 clnt = fid->clnt;
1211
1212 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1213 if (IS_ERR(req)) {
1214 err = PTR_ERR(req);
1215 goto error;
1216 }
1217
1218 P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1219
1220 p9_free_req(clnt, req);
1221
1222 error:
1223 return err;
1224 }
1225 EXPORT_SYMBOL(p9_client_fsync);
1226
1227 int p9_client_clunk(struct p9_fid *fid)
1228 {
1229 int err;
1230 struct p9_client *clnt;
1231 struct p9_req_t *req;
1232
1233 if (!fid) {
1234 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n");
1235 dump_stack();
1236 return 0;
1237 }
1238
1239 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1240 err = 0;
1241 clnt = fid->clnt;
1242
1243 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1244 if (IS_ERR(req)) {
1245 err = PTR_ERR(req);
1246 goto error;
1247 }
1248
1249 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1250
1251 p9_free_req(clnt, req);
1252 p9_fid_destroy(fid);
1253
1254 error:
1255 return err;
1256 }
1257 EXPORT_SYMBOL(p9_client_clunk);
1258
1259 int p9_client_remove(struct p9_fid *fid)
1260 {
1261 int err;
1262 struct p9_client *clnt;
1263 struct p9_req_t *req;
1264
1265 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1266 err = 0;
1267 clnt = fid->clnt;
1268
1269 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1270 if (IS_ERR(req)) {
1271 err = PTR_ERR(req);
1272 goto error;
1273 }
1274
1275 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1276
1277 p9_free_req(clnt, req);
1278 error:
1279 p9_fid_destroy(fid);
1280 return err;
1281 }
1282 EXPORT_SYMBOL(p9_client_remove);
1283
1284 int
1285 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1286 u32 count)
1287 {
1288 int err, rsize;
1289 struct p9_client *clnt;
1290 struct p9_req_t *req;
1291 char *dataptr;
1292
1293 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1294 (long long unsigned) offset, count);
1295 err = 0;
1296 clnt = fid->clnt;
1297
1298 rsize = fid->iounit;
1299 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1300 rsize = clnt->msize - P9_IOHDRSZ;
1301
1302 if (count < rsize)
1303 rsize = count;
1304
1305 /* Don't bother zerocopy for small IO (< 1024) */
1306 if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1307 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) {
1308 req = p9_client_rpc(clnt, P9_TREAD, "dqE", fid->fid, offset,
1309 rsize, data, udata);
1310 } else {
1311 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1312 rsize);
1313 }
1314 if (IS_ERR(req)) {
1315 err = PTR_ERR(req);
1316 goto error;
1317 }
1318
1319 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1320 if (err) {
1321 p9pdu_dump(1, req->rc);
1322 goto free_and_error;
1323 }
1324
1325 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1326
1327 if (!req->tc->pbuf_size) {
1328 if (data) {
1329 memmove(data, dataptr, count);
1330 } else {
1331 err = copy_to_user(udata, dataptr, count);
1332 if (err) {
1333 err = -EFAULT;
1334 goto free_and_error;
1335 }
1336 }
1337 }
1338 p9_free_req(clnt, req);
1339 return count;
1340
1341 free_and_error:
1342 p9_free_req(clnt, req);
1343 error:
1344 return err;
1345 }
1346 EXPORT_SYMBOL(p9_client_read);
1347
1348 int
1349 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1350 u64 offset, u32 count)
1351 {
1352 int err, rsize;
1353 struct p9_client *clnt;
1354 struct p9_req_t *req;
1355
1356 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1357 fid->fid, (long long unsigned) offset, count);
1358 err = 0;
1359 clnt = fid->clnt;
1360
1361 rsize = fid->iounit;
1362 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1363 rsize = clnt->msize - P9_IOHDRSZ;
1364
1365 if (count < rsize)
1366 rsize = count;
1367
1368 /* Don't bother zerocopy form small IO (< 1024) */
1369 if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1370 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) {
1371 req = p9_client_rpc(clnt, P9_TWRITE, "dqE", fid->fid, offset,
1372 rsize, data, udata);
1373 } else {
1374
1375 if (data)
1376 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1377 offset, rsize, data);
1378 else
1379 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1380 offset, rsize, udata);
1381 }
1382 if (IS_ERR(req)) {
1383 err = PTR_ERR(req);
1384 goto error;
1385 }
1386
1387 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1388 if (err) {
1389 p9pdu_dump(1, req->rc);
1390 goto free_and_error;
1391 }
1392
1393 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1394
1395 p9_free_req(clnt, req);
1396 return count;
1397
1398 free_and_error:
1399 p9_free_req(clnt, req);
1400 error:
1401 return err;
1402 }
1403 EXPORT_SYMBOL(p9_client_write);
1404
1405 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1406 {
1407 int err;
1408 struct p9_client *clnt;
1409 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1410 struct p9_req_t *req;
1411 u16 ignored;
1412
1413 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1414
1415 if (!ret)
1416 return ERR_PTR(-ENOMEM);
1417
1418 err = 0;
1419 clnt = fid->clnt;
1420
1421 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1422 if (IS_ERR(req)) {
1423 err = PTR_ERR(req);
1424 goto error;
1425 }
1426
1427 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1428 if (err) {
1429 p9pdu_dump(1, req->rc);
1430 p9_free_req(clnt, req);
1431 goto error;
1432 }
1433
1434 P9_DPRINTK(P9_DEBUG_9P,
1435 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1436 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1437 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1438 "<<< uid=%d gid=%d n_muid=%d\n",
1439 ret->size, ret->type, ret->dev, ret->qid.type,
1440 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1441 ret->atime, ret->mtime, (unsigned long long)ret->length,
1442 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1443 ret->n_uid, ret->n_gid, ret->n_muid);
1444
1445 p9_free_req(clnt, req);
1446 return ret;
1447
1448 error:
1449 kfree(ret);
1450 return ERR_PTR(err);
1451 }
1452 EXPORT_SYMBOL(p9_client_stat);
1453
1454 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1455 u64 request_mask)
1456 {
1457 int err;
1458 struct p9_client *clnt;
1459 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1460 GFP_KERNEL);
1461 struct p9_req_t *req;
1462
1463 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1464 fid->fid, request_mask);
1465
1466 if (!ret)
1467 return ERR_PTR(-ENOMEM);
1468
1469 err = 0;
1470 clnt = fid->clnt;
1471
1472 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1473 if (IS_ERR(req)) {
1474 err = PTR_ERR(req);
1475 goto error;
1476 }
1477
1478 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1479 if (err) {
1480 p9pdu_dump(1, req->rc);
1481 p9_free_req(clnt, req);
1482 goto error;
1483 }
1484
1485 P9_DPRINTK(P9_DEBUG_9P,
1486 "<<< RGETATTR st_result_mask=%lld\n"
1487 "<<< qid=%x.%llx.%x\n"
1488 "<<< st_mode=%8.8x st_nlink=%llu\n"
1489 "<<< st_uid=%d st_gid=%d\n"
1490 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1491 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1492 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1493 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1494 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1495 "<<< st_gen=%lld st_data_version=%lld",
1496 ret->st_result_mask, ret->qid.type, ret->qid.path,
1497 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1498 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1499 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1500 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1501 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1502 ret->st_gen, ret->st_data_version);
1503
1504 p9_free_req(clnt, req);
1505 return ret;
1506
1507 error:
1508 kfree(ret);
1509 return ERR_PTR(err);
1510 }
1511 EXPORT_SYMBOL(p9_client_getattr_dotl);
1512
1513 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1514 {
1515 int ret;
1516
1517 /* NOTE: size shouldn't include its own length */
1518 /* size[2] type[2] dev[4] qid[13] */
1519 /* mode[4] atime[4] mtime[4] length[8]*/
1520 /* name[s] uid[s] gid[s] muid[s] */
1521 ret = 2+4+13+4+4+4+8+2+2+2+2;
1522
1523 if (wst->name)
1524 ret += strlen(wst->name);
1525 if (wst->uid)
1526 ret += strlen(wst->uid);
1527 if (wst->gid)
1528 ret += strlen(wst->gid);
1529 if (wst->muid)
1530 ret += strlen(wst->muid);
1531
1532 if ((proto_version == p9_proto_2000u) ||
1533 (proto_version == p9_proto_2000L)) {
1534 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1535 if (wst->extension)
1536 ret += strlen(wst->extension);
1537 }
1538
1539 return ret;
1540 }
1541
1542 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1543 {
1544 int err;
1545 struct p9_req_t *req;
1546 struct p9_client *clnt;
1547
1548 err = 0;
1549 clnt = fid->clnt;
1550 wst->size = p9_client_statsize(wst, clnt->proto_version);
1551 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1552 P9_DPRINTK(P9_DEBUG_9P,
1553 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1554 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1555 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1556 " uid=%d gid=%d n_muid=%d\n",
1557 wst->size, wst->type, wst->dev, wst->qid.type,
1558 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1559 wst->atime, wst->mtime, (unsigned long long)wst->length,
1560 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1561 wst->n_uid, wst->n_gid, wst->n_muid);
1562
1563 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1564 if (IS_ERR(req)) {
1565 err = PTR_ERR(req);
1566 goto error;
1567 }
1568
1569 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1570
1571 p9_free_req(clnt, req);
1572 error:
1573 return err;
1574 }
1575 EXPORT_SYMBOL(p9_client_wstat);
1576
1577 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1578 {
1579 int err;
1580 struct p9_req_t *req;
1581 struct p9_client *clnt;
1582
1583 err = 0;
1584 clnt = fid->clnt;
1585 P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1586 P9_DPRINTK(P9_DEBUG_9P,
1587 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1588 " atime_sec=%lld atime_nsec=%lld\n"
1589 " mtime_sec=%lld mtime_nsec=%lld\n",
1590 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1591 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1592 p9attr->mtime_sec, p9attr->mtime_nsec);
1593
1594 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1595
1596 if (IS_ERR(req)) {
1597 err = PTR_ERR(req);
1598 goto error;
1599 }
1600 P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1601 p9_free_req(clnt, req);
1602 error:
1603 return err;
1604 }
1605 EXPORT_SYMBOL(p9_client_setattr);
1606
1607 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1608 {
1609 int err;
1610 struct p9_req_t *req;
1611 struct p9_client *clnt;
1612
1613 err = 0;
1614 clnt = fid->clnt;
1615
1616 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1617
1618 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1619 if (IS_ERR(req)) {
1620 err = PTR_ERR(req);
1621 goto error;
1622 }
1623
1624 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1625 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1626 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1627 if (err) {
1628 p9pdu_dump(1, req->rc);
1629 p9_free_req(clnt, req);
1630 goto error;
1631 }
1632
1633 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1634 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1635 "fsid %llu namelen %ld\n",
1636 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1637 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1638 sb->fsid, (long int)sb->namelen);
1639
1640 p9_free_req(clnt, req);
1641 error:
1642 return err;
1643 }
1644 EXPORT_SYMBOL(p9_client_statfs);
1645
1646 int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name)
1647 {
1648 int err;
1649 struct p9_req_t *req;
1650 struct p9_client *clnt;
1651
1652 err = 0;
1653 clnt = fid->clnt;
1654
1655 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1656 fid->fid, newdirfid->fid, name);
1657
1658 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1659 newdirfid->fid, name);
1660 if (IS_ERR(req)) {
1661 err = PTR_ERR(req);
1662 goto error;
1663 }
1664
1665 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1666
1667 p9_free_req(clnt, req);
1668 error:
1669 return err;
1670 }
1671 EXPORT_SYMBOL(p9_client_rename);
1672
1673 /*
1674 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1675 */
1676 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1677 const char *attr_name, u64 *attr_size)
1678 {
1679 int err;
1680 struct p9_req_t *req;
1681 struct p9_client *clnt;
1682 struct p9_fid *attr_fid;
1683
1684 err = 0;
1685 clnt = file_fid->clnt;
1686 attr_fid = p9_fid_create(clnt);
1687 if (IS_ERR(attr_fid)) {
1688 err = PTR_ERR(attr_fid);
1689 attr_fid = NULL;
1690 goto error;
1691 }
1692 P9_DPRINTK(P9_DEBUG_9P,
1693 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1694 file_fid->fid, attr_fid->fid, attr_name);
1695
1696 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1697 file_fid->fid, attr_fid->fid, attr_name);
1698 if (IS_ERR(req)) {
1699 err = PTR_ERR(req);
1700 goto error;
1701 }
1702 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1703 if (err) {
1704 p9pdu_dump(1, req->rc);
1705 p9_free_req(clnt, req);
1706 goto clunk_fid;
1707 }
1708 p9_free_req(clnt, req);
1709 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
1710 attr_fid->fid, *attr_size);
1711 return attr_fid;
1712 clunk_fid:
1713 p9_client_clunk(attr_fid);
1714 attr_fid = NULL;
1715 error:
1716 if (attr_fid && (attr_fid != file_fid))
1717 p9_fid_destroy(attr_fid);
1718
1719 return ERR_PTR(err);
1720 }
1721 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1722
1723 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1724 u64 attr_size, int flags)
1725 {
1726 int err;
1727 struct p9_req_t *req;
1728 struct p9_client *clnt;
1729
1730 P9_DPRINTK(P9_DEBUG_9P,
1731 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
1732 fid->fid, name, (long long)attr_size, flags);
1733 err = 0;
1734 clnt = fid->clnt;
1735 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
1736 fid->fid, name, attr_size, flags);
1737 if (IS_ERR(req)) {
1738 err = PTR_ERR(req);
1739 goto error;
1740 }
1741 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
1742 p9_free_req(clnt, req);
1743 error:
1744 return err;
1745 }
1746 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
1747
1748 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
1749 {
1750 int err, rsize;
1751 struct p9_client *clnt;
1752 struct p9_req_t *req;
1753 char *dataptr;
1754
1755 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
1756 fid->fid, (long long unsigned) offset, count);
1757
1758 err = 0;
1759 clnt = fid->clnt;
1760
1761 rsize = fid->iounit;
1762 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
1763 rsize = clnt->msize - P9_READDIRHDRSZ;
1764
1765 if (count < rsize)
1766 rsize = count;
1767
1768 if ((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1769 P9_TRANS_PREF_PAYLOAD_SEP) {
1770 req = p9_client_rpc(clnt, P9_TREADDIR, "dqF", fid->fid,
1771 offset, rsize, data);
1772 } else {
1773 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
1774 offset, rsize);
1775 }
1776 if (IS_ERR(req)) {
1777 err = PTR_ERR(req);
1778 goto error;
1779 }
1780
1781 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1782 if (err) {
1783 p9pdu_dump(1, req->rc);
1784 goto free_and_error;
1785 }
1786
1787 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
1788
1789 if (!req->tc->pbuf_size && data)
1790 memmove(data, dataptr, count);
1791
1792 p9_free_req(clnt, req);
1793 return count;
1794
1795 free_and_error:
1796 p9_free_req(clnt, req);
1797 error:
1798 return err;
1799 }
1800 EXPORT_SYMBOL(p9_client_readdir);
1801
1802 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
1803 dev_t rdev, gid_t gid, struct p9_qid *qid)
1804 {
1805 int err;
1806 struct p9_client *clnt;
1807 struct p9_req_t *req;
1808
1809 err = 0;
1810 clnt = fid->clnt;
1811 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
1812 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
1813 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
1814 MAJOR(rdev), MINOR(rdev), gid);
1815 if (IS_ERR(req))
1816 return PTR_ERR(req);
1817
1818 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1819 if (err) {
1820 p9pdu_dump(1, req->rc);
1821 goto error;
1822 }
1823 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
1824 (unsigned long long)qid->path, qid->version);
1825
1826 error:
1827 p9_free_req(clnt, req);
1828 return err;
1829
1830 }
1831 EXPORT_SYMBOL(p9_client_mknod_dotl);
1832
1833 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
1834 gid_t gid, struct p9_qid *qid)
1835 {
1836 int err;
1837 struct p9_client *clnt;
1838 struct p9_req_t *req;
1839
1840 err = 0;
1841 clnt = fid->clnt;
1842 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
1843 fid->fid, name, mode, gid);
1844 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
1845 gid);
1846 if (IS_ERR(req))
1847 return PTR_ERR(req);
1848
1849 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1850 if (err) {
1851 p9pdu_dump(1, req->rc);
1852 goto error;
1853 }
1854 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
1855 (unsigned long long)qid->path, qid->version);
1856
1857 error:
1858 p9_free_req(clnt, req);
1859 return err;
1860
1861 }
1862 EXPORT_SYMBOL(p9_client_mkdir_dotl);
1863
1864 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
1865 {
1866 int err;
1867 struct p9_client *clnt;
1868 struct p9_req_t *req;
1869
1870 err = 0;
1871 clnt = fid->clnt;
1872 P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
1873 "start %lld length %lld proc_id %d client_id %s\n",
1874 fid->fid, flock->type, flock->flags, flock->start,
1875 flock->length, flock->proc_id, flock->client_id);
1876
1877 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
1878 flock->flags, flock->start, flock->length,
1879 flock->proc_id, flock->client_id);
1880
1881 if (IS_ERR(req))
1882 return PTR_ERR(req);
1883
1884 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
1885 if (err) {
1886 p9pdu_dump(1, req->rc);
1887 goto error;
1888 }
1889 P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
1890 error:
1891 p9_free_req(clnt, req);
1892 return err;
1893
1894 }
1895 EXPORT_SYMBOL(p9_client_lock_dotl);
1896
1897 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
1898 {
1899 int err;
1900 struct p9_client *clnt;
1901 struct p9_req_t *req;
1902
1903 err = 0;
1904 clnt = fid->clnt;
1905 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
1906 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
1907 glock->start, glock->length, glock->proc_id, glock->client_id);
1908
1909 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
1910 glock->start, glock->length, glock->proc_id, glock->client_id);
1911
1912 if (IS_ERR(req))
1913 return PTR_ERR(req);
1914
1915 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
1916 &glock->start, &glock->length, &glock->proc_id,
1917 &glock->client_id);
1918 if (err) {
1919 p9pdu_dump(1, req->rc);
1920 goto error;
1921 }
1922 P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
1923 "proc_id %d client_id %s\n", glock->type, glock->start,
1924 glock->length, glock->proc_id, glock->client_id);
1925 error:
1926 p9_free_req(clnt, req);
1927 return err;
1928 }
1929 EXPORT_SYMBOL(p9_client_getlock_dotl);
1930
1931 int p9_client_readlink(struct p9_fid *fid, char **target)
1932 {
1933 int err;
1934 struct p9_client *clnt;
1935 struct p9_req_t *req;
1936
1937 err = 0;
1938 clnt = fid->clnt;
1939 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
1940
1941 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
1942 if (IS_ERR(req))
1943 return PTR_ERR(req);
1944
1945 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
1946 if (err) {
1947 p9pdu_dump(1, req->rc);
1948 goto error;
1949 }
1950 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
1951 error:
1952 p9_free_req(clnt, req);
1953 return err;
1954 }
1955 EXPORT_SYMBOL(p9_client_readlink);
linux-next